netdev - Re: [PATCH net-next v3 1/3] vsock/virtio: use skb_frag

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Date: Tue, 2 Jan 2024 11:00:12 +0100
From: Stefano Garzarella <sgarzare@...hat.com>
To: Mina Almasry <almasrymina@...gle.com>
Cc: linux-kernel@...r.kernel.org, netdev@...r.kernel.org, 
	kvm@...r.kernel.org, virtualization@...ts.linux.dev, 
	"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
	Stefan Hajnoczi <stefanha@...hat.com>, David Howells <dhowells@...hat.com>, 
	Jason Gunthorpe <jgg@...dia.com>, Christian König <christian.koenig@....com>, 
	Shakeel Butt <shakeelb@...gle.com>, Yunsheng Lin <linyunsheng@...wei.com>, 
	Willem de Bruijn <willemdebruijn.kernel@...il.com>
Subject: Re: [PATCH net-next v3 1/3] vsock/virtio: use skb_frag_*() helpers

On Wed, Dec 20, 2023 at 01:45:00PM -0800, Mina Almasry wrote:
>Minor fix for virtio: code wanting to access the fields inside an skb
>frag should use the skb_frag_*() helpers, instead of accessing the
>fields directly. This allows for extensions where the underlying
>memory is not a page.
>
>Signed-off-by: Mina Almasry <almasrymina@...gle.com>
>
>---
>
>v2:
>
>- Also fix skb_frag_off() + skb_frag_size() (David)
>- Did not apply the reviewed-by from Stefano since the patch changed
>relatively much.

Sorry for the delay, I was off.

LGTM!

Acked-by: Stefano Garzarella <sgarzare@...hat.com>

Possibly we can also send this patch alone if the series is still under
discussion because it's definitely an improvement to the current code.

Thanks,
Stefano

>
>---
> net/vmw_vsock/virtio_transport.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
>diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transport.c
>index f495b9e5186b..1748268e0694 100644
>--- a/net/vmw_vsock/virtio_transport.c
>+++ b/net/vmw_vsock/virtio_transport.c
>@@ -153,10 +153,10 @@ virtio_transport_send_pkt_work(struct work_struct *work)
> 				 * 'virt_to_phys()' later to fill the buffer descriptor.
> 				 * We don't touch memory at "virtual" address of this page.
> 				 */
>-				va = page_to_virt(skb_frag->bv_page);
>+				va = page_to_virt(skb_frag_page(skb_frag));
> 				sg_init_one(sgs[out_sg],
>-					    va + skb_frag->bv_offset,
>-					    skb_frag->bv_len);
>+					    va + skb_frag_off(skb_frag),
>+					    skb_frag_size(skb_frag));
> 				out_sg++;
> 			}
> 		}
>-- 
>2.43.0.472.g3155946c3a-goog
>